Ride-sharing services, like Uber and Lyft, have decidedly changed the way we travel—it’s now completely acceptable to hop into a car with a random stranger you've summoned with your handy cell—and now some of those same concepts could change the way we work out for good.

Before Lyft, taxis were overpriced and a little outdated, and the same could be said for traditional gyms, says Raj Kapoor, an early investor with Lyft. When he realized that the group classes and bootcamps he loved didn’t fit into his schedule once he had kids, he was inspired to change up the fitness world.

His fix for what he felt was a broken industry? Fitmob, a fitness app that’s gained 10,000 users since its launch in January.

"Just as Lyft riders can be picked up anywhere, fitness classes don’t have to be inside a gym to be effective," says Kapoor. "We’re redefining what a group class is, because it can happen in a park, it can happen anywhere."

Or maybe you want to work out with a larger group, but the class offerings at your local gym just aren’t convenient. With Kapoor’s Fitmob, you can find a class that works with your schedule, whether you want to work out early in the morning, during a lunch break, or at the end of the day. Exercising with a group—or in this case, a mob—makes it almost like a social event, says Kapoor. "If it becomes an experience that feels fun, you’re much more likely to look forward to it." You and a couple of friends could also sign up for MobTribes, Fitmob’s new small group classes.

Both Fitmob and Vint are currently only available in San Francisco, but they both plan to expand to other US cities in the coming months. "This is really a new movement we’re creating," says Eriksson. "We’re unlocking a new world of workouts."